Famous AMD + Nvidia combination, and maybe a Via chipset?

Try this:
- uninstall all nvidia drivers and use a standard SVGA windows driver.
- Use a Nvidia driver clean-up utility (see at Guru3d site)
- Install driver 44.03: this one is ok for directX 9 but is much more stable than later drivers, in such a hardware config.

I made many tests, and it was the best version for me.

Good luck,
Philippe